Not work on iOS 13.2.3, iPad Mini 4

[dzungpv]

I use this library for years for production. Recently I found this bug on iOS 13.2.3, iPad Mini4 connect over wifi.
How to produce the bug: Connect the iPad to the wifi network and then disconnect optical cable (simulate lost internet connection). But it continue to "REACHABLE".
I have not test this on the iPhone.
Code test on Xcode 11.2.1, MacOS 10.14.4:

// Allocate a reachability object
Reachability* reach = [Reachability reachabilityWithHostname:@"www.google.com"];

// Set the blocks
reach.reachableBlock = ^(Reachability*reach)
{
    // keep in mind this is called on a background thread
    // and if you are updating the UI it needs to happen
    // on the main thread, like this:

    dispatch_async(dispatch_get_main_queue(), ^{
        NSLog(@"REACHABLE!");
    });
};

reach.unreachableBlock = ^(Reachability*reach)
{
    NSLog(@"UNREACHABLE!");
};

// Start the notifier, which will cause the reachability object to retain itself!
[reach startNotifier];

[mantasoff]

I am still getting the same error. Most of the ping requests return Reachable (iPhone simulator)